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package Abh::SimpleSet;

...

# Must return true
1;

use Abh::SimpleSet;

...
$set2->add("e");
$set2->add("f");
print "Set 2: " . $set2->to_string() . "\n";

Set 1: (a, b, c)
Set 2: (e, f, a, b, c, d)